Vehicle Control in Full Unsteady Flow Using Surface Measurements

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dc.contributor.advisor Dr. Ashok Gopalarathnam, Committee Member en_US
dc.contributor.advisor Dr. Fred Dejarnette, Committee Member en_US
dc.contributor.advisor Dr. Larry Silverberg, Committee Chair en_US
dc.contributor.advisor Dr. Winser Alexander, Committee Member en_US
dc.contributor.author Levedahl, Blaine Alexander en_US
dc.date.accessioned 2010-04-02T19:18:44Z
dc.date.available 2010-04-02T19:18:44Z
dc.date.issued 2010-03-16 en_US
dc.identifier.other etd-02272010-190048 en_US
dc.identifier.uri http://www.lib.ncsu.edu/resolver/1840.16/5721
dc.description.abstract This dissertation is the first comprehensive attempt to address a new engineering problem: control of a vehicle maneuvering in a full unsteady flow field. The approach to the solution is focused in three main areas: modeling of a vehicle in full unsteady flow, control of a vehicle in full unsteady flow, and synthesizing the fluid loads for use in control of a vehicle maneuvering in a full unsteady flow field. To model a vehicle maneuvering in a full unsteady flow field this dissertation develops the Coupled Fluid Vehicle (CFV) model in which the fluid, which is a sum of a finite number of spatially dependent velocity fields whose contributions vary with time, is coupled to the vehicle rigid-body equations of motion. To control a vehicle maneuvering in a full unsteady flow field this dissertation develops the Fluid Compensation Control (FCC) strategy which gives the designer an opportunity to include the fluid states, in addition to the vehicle states, in the control law and an opportunity to balance reducing the fluid dynamic load through compensation and reducing the state error through regulation. To synthesize the fluid loads this dissertation has attempted to forward current work on the prediction of fluid loads from stagnation and separation point measurements using the Kutta principle, which says that the velocity around a vehicle is a smoothly varying function and that it is determined up to a multiplicative constant by its nodes (stagnation, separation, and reattachment points/lines), and by conducting an experiment to attempt to determine the correlation of the fluidic loads from the orientation and separation lines on a 3-dimensional bluff body. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Vehicle Control en_US
dc.subject Unsteady Fluid Dynamics en_US
dc.subject UUVs en_US
dc.subject UAVs en_US
dc.title Vehicle Control in Full Unsteady Flow Using Surface Measurements en_US
dc.degree.name PhD en_US
dc.degree.level dissertation en_US
dc.degree.discipline Aerospace Engineering en_US


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